Corundum-mill



/(TNb Model.

-- H. S. LUCAS.

GORUNDUM MILL.

Y IIHIIN! w %/TNESSESI v 1 ATTORNEYS;

' Ni'rnn STATES HEMAN S. LUCAS, OF FRANKLIN, NORTH CAROLINA.

CQRUNDUM-MILL.

SPECIFICATION forming part of Letters Patent No. 538,115, dated April23, 1895.

Application filed nuary 22, 1895. Serial No. 535,781. (No model.)

To aZZ whom it may concern.-

Be it known that I, HEMAN S. LUCAS, of Franklin, in the county of Maconand State of North Carolina, have invented a new and ImprovedGornndum-Mill, of which the following is a full, clear, and exactdescription.

the improvement.

Fhe invention relates to cleaning and polishing machines; and its objectis to provide a new and improved mill, more especially designedforpreparing natural corundum and emery ore for the market, in a verysimple and inexpensive manner.

The invention consists principally of a casing provided with removablebottoms, and a revoluble shaft arranged in the casing and provided witha cam for feeding material to the said bottom and pressing and rubbingthe grains of corundum to clean the same of gangue.

The invention also consists of certain parts and details andcombinations of the same, as will be fully described hereinafter andthen pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the views.

Figure 1 is a sectional front elevation of i Fig. 2 is a side elevationof the casing. Fig. 3 is a sectional plan View of the same, on the line3--3 of Fig. 1; and Fig. 4 is a similar view of the same, on the line4-4 of Fig.1.

The improved cleaning and polishing machine is provided with a suitablyconstructed frame A, on which is secured a vertically disposedcylindrical casing B, provided with one or more sets of bottoms O and Odividing the casing into upper and lower compartments B and 13 asindicatedin Fig. 1. Each set of bottoms is made in two sections, fittedto slide sidewise by screws D, D or other suitable means, so as to openthe upper compartment into the lower one on opening the set of bottomsO, and discharge the material from the lower compartment B whenever thelower bottoms O are opened.

In the casing B extends centrally, the vertically disposed shaft E,mounted to turn in suitable bearings arranged on the frame A, andprovided at its upper end with a pulley F, connected by a belt withother machinery, to impart a rotary motion to the said shaft. On theshaft and within the compartments B and B of the casing E, are securedthe spirals G and G respectively, terminating at the lower ends in thewings or cams G and G3 respectively, to within a short distance of thebottoms O and O, and to within a short distance of the inner surface ofthe casing B.

The operation is as follows: When starting the machine, the bottoms Cand O are closed by being moved inward, and then the material to betreated is introduced into the upper compartment B through the spout H,the shaft E is revolved so that the spiral G feeds the corundumdownward, and the lower cam G tends to rub the corundum against thebottom 0, and also causes the two to rub against one another to free thematerial from the gangue which works upward above the corundum, whilethe latter remains on the bottom. When it is desired to discharge the'corundum material, the operator opens the bottom 0 so that the corundumpasses with the material into the second compartment B in which theabove described operation is repeated, and a further cleaning andpolishing of the material takes place, so that finally when the bottomsO are opened, the corundum leaves the machine perfectly prepared andready for the market.

The bottoms G and O are supported within the casing B on suitableguideways or rods 0 indicated in Figs. 1 and 4, so that any downwardpressure during the operation is sustained by the said guideways orsupporting rods.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent- 1. A corundum mill, comprising a casingprovided with sidewise opening bottoms, a revoluble shaft arranged inthe casing, a spiral held on the shaft within the casing, the saidspiral increasing in width toward its lower end and terminating in awing or cam, as and for the purpose set forth.

2. A corundum mill, comprising a casing, tion of the said spiral andterminating a suit sidewise opening bottoms held in the casing, abledistance above the said bottoms, submeans for adjusting the saidbottoms, a shaft stantially as shown and described.

mounted to revolve Within the casing, a spiral HEMAN S. LUCAS. 5 held onthe shaft within the casing, the said Witnesses:

spiral increasing in width toward the lower J. W. STANFIELD,

end, and a wing or cam forming a continua- ELLEN A. BIDWELL.

